Boring machine



Oct. 14, 1952 Filed June 27, 1947 G. BRINKMANN BORING MACHINE 18 Sheets-Sheet 1 Gwen: her Ybvinkmam in! CU (HTTOFLAQBY- Oct. 14, 1952 Filed June 2'7, 1947 G. BRINKMANN BORING MACHINE 18 Sheets-Sheet 2 Guenthev- 3 Hnkmavum G. BRINKMANN BORING MACHINE Oct. 14, 1952 18 Sheets-Sheet 5 Filed June 27, 194i? I Guenthgvfbr-ivxkmcynq flTToRmsY Oct. 14, 1952 G. BRINKMANN BORING MACHINE l8 Sheets-Sheet 4 Filed June 27, 1947 NVEJN TO W Guencher BrinkmO QL a M: 0.1%.. 5 W ffl (RTTOP-NET-YJ Oct. 14, 1952 Filed June 27, 1947 G. BRINKMANN BORING MACHINE 18 Sheets-Sheet 5 NVENTOF yard-he v- @rMKmcnq Oct. 14, 1952 Filed June 27, 1947 G. BRINKMANN 2,613,554

BORING MACHINE 1s Sheets-Sheta m w. Guewtherrarimxmmmm 4 4 W9 4/ Oct. 14, 1952 2,613,554

G. BRINKMANN BORING MACHINE Filed June 27, 1947 18 Sheets-Sheet 8 LEW- nt 3w, G-uencherl3 r-inkmarm Oct. 14, 1952 G. BRINKMANN 2,613,554

BORING MACHINE Filed June 27, 1947 18 Sheets-Sheet 9 Oct. 14, 1952 G. BRINKMANN 2,613,554

- BORING MACHINE Filed June- 27, 1947 18 Sheets-Sheet l0 i NYENTOQH Guenkhevfirinkmfinn Oct. 14, 1952 G. BRINKMANN 2,613,554

BORING MACHINE Filed June 2'7, 1947 18 Sheets-Sheet l1 H xi n V iNVsN-rck' III/4 u 4 eflflner (bruit/mam fi r-ranwav Oct. 14, 1952 e. BRINKMANN 2,613,554

BORING MACHINE Filed June 27. 1947 l8 Shees-Sheet 13 LSIO is? c 219 22 (LR-Prom ape-1' Oct. 14, 1952 BRlNKMANN 2,613,554

BORING MACHINE Filed June 27, 1947 18 Sheets-Sheet l4 F'gl? Us l 2 243 LS \d 242 24:

Mal IBO G Mani-her- @rfnkm 1952 G. BRINKMANN 2,613,554

BORING MACHINE Filed June 27, 1947 18 Sheets-Sheet 15 SSSSSS RE EXHAUST 252@ @255 /35 5V3 A 5v 3 l7 Ffil 3WD 8 1 CARR] ER ADVANCE 'RETURN UL JUU 5%E] 5% Lke hfiher' grin kma u (BTTORNEXJ Oct. 14, 1952 G. BRINKMANN 2,613,554

BORING MACHINE Filed June 27, 1947 18 Sheets-Sheet l6 mg Guenther- Ewinkmuvm v CBTTORNEZYJ Oct. 14, 1952 G. BRINKMANN 2,613,554

BORING MACHINE Filed June 27, 1947 18 Sheets-Sheet l8 CARRIER ADVANCE FINGER REAR. CLAMP RETURN m Gu'en thew BYiYIK HQYW Patented Oct. 14, 1952 BORING MACHINE Guenther Brinkmann, Detroit, Mich., assignor to Ex-Cell-O Corporation, Detroit, Mich., a corporation of Michigan Application June 27, 1947, Serial No. 757,629

12 Claims.

1 The present invention relates to boring machines. and has particular reference to improvements in machines adapted for the boring of wrist pin bosses of automotive engine pistons.

One of the objects of the invention is to provide a wrist pin boss.- boring machine which is automatically self-loading and unloading, and which, more particularly, is constructed and arranged to advance a series of pistons in continuous succession from a point of entry, such as a supply chute, through the operating units of the machine to a point of exit, such as a discharge chute, and successively to locate, clamp, bore and release each piston in the course of its progress therethrough.

Another and more specific object is to provide a machine of the foregoing character for boring pistons which previously have been finished or semi-finished automatically with cored or roughbored wrist pin holes, and each of which in the course of movement through the machine is subjected to substantially the following automatic sequence of operations:

in parallelism with the axis of a boringtool in a common plane.

5. Clamped radially on a carrier and shifted I axially therewith into a work chuck or fixture to locate the axis of the wrist pin holes in alignment with the axis of the boring tool.

6. Clamped in located position within the work fixture.

7. Bored through the wrist pin holes by axial translation of the rotating boring tool in a selective program of rapid approach and alternating first and second feed movements to rough and finish bore first one hole and then the other.

8. Preferably gauged for correct size of the bored holes.

9. Unclamped from the work fixture, and then displaced therefrom into the discharge chute by insertion of the next piston.

Further objects reside in' the provision of novel features embodied in the various operating units of the machine, such as the work 10- cating means, and the various work clamping means, and in the combined mechanical, hydraulic and electrical controls which permit se- 2 lectively of full automatic cycling or hand cycling. I

Other objects and advantages will become apparent as the description proceeds.

In the accompanping drawings,

Figure 1 is a perspective view, from the front and right end, of a piston wrist pin boss boring machine embodying the features of the present invention.

Fig. 2 is a perspective left end view of the machine, with various covers removed.

Fig. 3 is a perspective view on an enlarged scale, of the front of the machine with various covers removed.

Figs. 3a to 32 inclusive are fragmentary diagrammatic views illustrating successive steps in loading, positioning and clamping a piston preparatory to the boring operation.

Fig. 37' is a sectional view showing the relation of the piston and the boring tool after the first boss has been bored.

Fig. 4 is a fragmentary view on an enlarged scale of the left end of the machine, and illustrating the drive means for rotating the piston in the radial locating operation, and the carrier for translating the located piston axially to the work fixture.

Fig. 5 is a fragmentary horizontal sectional view taken substantially along line 5-5 of Fig. 4.

Fig. 6 is a fragmentary sectional view of the work supply mechanism for delivering the pistons one by one to the locating mechanism in successive machine cycles.

Fig. 7 is a fragmentary right-hand sectional view of the supply mechanism illustrated in Fig. 6.

Fig. 8 is a fragmentary sectional detail view taken substantially along line 8--8 of Fig. 7

Fig. 8a is a fragmentary vertical sectional view of the work carrier and initial clamp.

Fig. 9 is a fragmentary view, partially in section, of the control associated with the work carrier.

Fig. 10 is 'a view similar to Fig. 8a., but illustrating the initial work clamp in a different position of operation.

Fig. 11 is a fragmentary longitudinal vertical sectional view through the machine, and illustrating the locating actuator and the final work clamp in retracted position.

Fig. 12 is a fragmentary detail view of a retractable stop forming part of the preliminary work locating means.

Fig. 13 is a fragmentary transverse vertical sectiorial View of the work locating means and illustrating the initial position of operation, the view being taken substantially along line l3-l3 of Fig. 11.

Figs. 14 and 15 are fragmentary views, similar to Fig. 13 on a somewhat larger scale, and illustrating the work locating means respectively in the second and third positions of operation.

Fig. lfiis a fragmentary vertical sectional view, on an enlarged scale, showing the final work clamp in operative position.

Fig. 1'7 is a fragmentary end elevational view taken along line l'i-|'l of Fig. 11 of the final work clamp and controls associated'therewith.

Fig. 18 is a fragmentary sectional view taken substantially along line |8l8 of Fig. 8a, including also the means for directing the hydraulic fluid to the clamp actuator.

Fig. 19 is a fragmentary plan view of the control valve assembly for .the machine, certain of said valves being shown in axial section.

Fig. 20 is a diagrammatic representation ot-the hydraulic operating circuits fo the machine.

Figs. 21 and-22am a'diagrammaticrepresentation of the electrical control circuits for the machine.

Referring now to the drawings and particularly to Figs. 1, 2 and 3, the machine, constituting the exemplary embodiment of the invention, has a composite .irame structure comprisingamain'bed I4 adapted to 'besupported on a suitable foundation, a pluralityof base sections 15 and l6-superimposed on the bed and separated at the front thereof to define an intermediate space ll therebetween, .and a plurality of sub-base sections and brackets as hereinafter defined mounted on the base sections for supporting various operating units or instrumentalities. These units include .a tool head it mounted on the rear end of the base'section l6 and having a rotary tool spindle l9 translatable axially towardand from the-front of the machine; a --work chuck or fixture 20 mounted on'the forwardportion of the base section It; :a work'supply mechanism 2-l for releasing the pistons to be bored one-at a'time; a work locating mechanism 22 for receiving and orientating the pistons both axially and radially; a work clampand carrier mechanism 23 for-transferring each piston after-orientation into the work fixture 2B; and a work clamping mechanism 24 for securing the piston in boring position. Also included as part of the aforementioned units are various motors and control.'instrumentalities, such as a reversible electric motor 25 for driving the tool spindle 1-9; a series of hydraulic motors or actuators 26 to 32, preferably of the reciprocatory cylinder and piston type, for providing translator motive force respectivel to the tool spindle 1'9, the work supply mechanism 2i, the locating mechanism 22, the initial work clamp, the work carrier 23,, the final work clamp 24,-and a size gauge; an electric motor 33 for'driving,-.certain elements of the locating mechanism 22; a hydraulic transmission system comprising an electric drive motor 34 and a valve panel 35; and an electric control system comprising a manual switch panel 3-6 and various relays, solenoids and limit switches as hereinafter-described for coordinating and timing the successive stepsin the machine cycle.

The pistons, which constitute the workpieces W to be bored, are either finished or semi-finished in respect of certain dimensions before being supplied to the machine so as to facilitate accurate location or alignment. Thus, the skirt and ring groove belt diameters are previously ma- 2| (see Figs. 4, 6, '7 and 8).

4 chined. The unfinished pin boss bores B (see Fig. 16) are either previously rough-bored or cored in the die casting operation.

Work supply mechanism may be ofany suitable character adapted to release the pistons to be bored from a supply chute or hopper 3l'..t'o the initial locating station. In

the "presentirrs'tancc, a chute 3'! of rectangular cross section and zigzag construction is mounted in overhead relation to the space I! on a bracket 38 bolted to the rear of the base section IS. The upper end of the chute '31 is provided with a coupling flange 39 by means of which it may be connected to an extensionor hopper (not shown) intothe inletend of which the pistons W may be dropped manually. In the preferred form, the

chutes! isnf ausize and :shape to'receive the pistonsW transversely-of the axis of the spindle I 9 with theircrown'edends disposed toward the left and their sli-irten'ds disposed toward the right. The zigzag I construction serves to relieve the weight on thelowermost pistons'which pile up in seriesagainst the outlet.

' 'Atlthe lower'end, the chute 31 is formed with an inclined outletlsection-loextending at a downward and forward :a'n'gle toward the work receivingstaticn in thezmachinet proper. The open end of the section 40 is normally closed by a combination trip gate and :escapement which when closedservesto hold'th'eipistons in .the chute 37, and which is operable periodically each time to release the lowermost ipiston. In the preferred form, the gate comprises two trip levers H mounted in axially spaced relation on a transverse .rocksh'aft 42. .for .swinging movement alternately into closedand opened position. The shaft 42 is suitably journaled in a bearing lug 43 on an upstanding supporting bracket, and a spaced lug "44 ontheopposite side of the chute 37. Each of the "levers 4| is formed with an arcuate cavity 45 adapted to pocket the lowermost piston W when the gate is closed (see Fig. 6), and on one :end witlr a convex surface 46 adapted to intercept and retain the next piston as the gate is opened (see Fig. 8). Thus, one end of each 'leverconstitutes atrip-arm for normally holding and when tripped for releasing the lowermost piston, and the'other end constitutes an escapement arm-for"intercepting the next piston as the lower piston is being released and subsequently dropping this piston into the lowermost position. A depending guide strip 41 on the opposite side of the chute -outlet-serves to restrain the piston W axially as'it-is-dropped from the gate.

Anysuitable means may be provided for oscillating "the shaft 42 as required to release the pistons one by one for successive machine cycles. In the present instance, this meanscomprises the hydraulic actuator 21 which is mounted on the bracket 38, and' which has a piston rod '48 connecte'dl'through a "link 49 to a crank arm 50 on one end of the rockshaft 42. The hydraulic actuator .21 (see Figs. .19 and 20) is connected at opposite .ends. throug-hfluid supply and exhaust lines lil'and 52'1eading to a reciprocatory direction valve 53 on the valvepanel 35. Opposite ends of the valve plunger 54 are connected for reverse operation respectively to a trip solenoid SVIA and a reset so eno d SVI'B. When the solenoid SVIA 

